毕业设计：廊坊市SDH传输网扩容的设计.docVIP

摘 要 随着通信业务的发展，数据通信也有了新的进步，其主要表现在应用种类的增加，宽带使用率的急速上升，这使得廊坊市现有的传输网络无法适应这种需求，为更好的满足人们的需要，必须有一新的技术代替原有的技术，实现网络的互联。美国贝尔实验室提出了SDH并逐步成为当今世界通信领域在传输技术方面的一个发展热点，SDH的出现完全改变了光通信的方式。 ABSTRACT Along with the development of communication services, data communication have the new progress in the application, and the main performance, the number of categories of the broadband adoption rapidly increase, which makes Beijing daxing district existing transmission network cant adapt to this demand, to better satisfy peoples needs, there must be a new technology instead of the original technology to realize network interconnection. American bell LABS proposes SDH and gradually become communications field in the world today in transmission technology, a development the emergence of SDH hot completely changed the access way optical. This paper in Beijings daxing district as an example, through investigation of transmission daxing district, and now new technology combining SDH network transmission, thus puts forward the rebuilding scheme, this plan by adding web site, the transformation network transmission mode, etc, to optimize the existing network, and consider and expanded the networks protection and synchronous way, so as to improve the reliability of the network transmission. Key words: SDH; equipment; network structure; dilatation；MSP;PP 目 录 摘 要 ……………………………………………………………… ….. I 1绪 论 ……………………………………………………………………1 1.1 廊坊市网络传输现状…………………………………………………… 2 1.2现网存在的弊端…………………………………………………………. 4 2 SDH网络的原理及特点 ………………………………………………… 5 2.1 SDH网络概述…………………………………………………………… 5 2.2 SDH传输原理………………………………………………………………6 2.3 SDH传输设备………………………………………………………………8 2.4 SDH传输网络基本拓扑结构…………………………………………… 11 2.5 SDH网络的特点………………………………………………………… 12 2.6 SDH的前景……………………………………………………………… 12 3. SDH传输网的保护方式 ………………………………………… …… 14 3.1 环网自愈保护……………………………………………………………14 3.1.1 单向通道环保护原理………………………………………………… 14 3.1.2 双纤双向复用段保护环——双纤共享复用段保护环……………… 16 3.1.3 两种自愈环的比较…………………………………………………… 17 3.2 子网连接保护…………………………………………………………… 18 4 SDH网络扩容的设计……………………………